Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1266b449ec31c35…

MALICIOUS

PDF

79.5 KB Created: 2021-03-18 19:43:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1eabacc1f68a63748c60ab1db28157d3 SHA-1: d4de2decdc160f3ac0bf24feb734c738b418844c SHA-256: e1266b449ec31c35f7f4a71f6743bfcaf03f79104429ee813217033058a30381
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to direct users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dugedepap.ru/award?keyword=algebra+1+textbook+pdf+mcgraw+hill+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446634/normal_600e693a40bbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_6027f7111abef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419822/normal_5fede8fc9df65.pdfIn PDF document text
    • https://jegolufu.weebly.com/uploads/1/3/4/6/134677495/640041a144df3.pdfIn PDF document text
    • https://metuliwilive.weebly.com/uploads/1/3/4/3/134386481/gimur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501361/normal_5fd76e3ca26a1.pdfIn PDF document text
    • http://fudazozotakaxal.mywebcommunity.org/abstract_class_and_interface_in_java_with_example.pdfIn PDF document text
    • https://pulaberiboz.weebly.com/uploads/1/3/0/7/130775840/gegalimater.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379610/normal_603abaec68a20.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/51175d9b-fc69-4e8a-a976-8068d15796bc/4_oracle_database_11g_pl_sql_fundamentals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9299f49-d725-406b-b71d-e5dd4777abb3/duromax_xp4400eh_dual_fuel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34d03b18-a04d-4d8f-a7a1-5d306ffa4e35/agile_methodology_including_scrum_and_kanban_methods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc67f94b-b260-4867-b967-476813bd8305/poziwadawezifaxerokejilu.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/trane_xv95_furnace_installation_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9643f422-4d09-4cc3-bbc3-530ee5608ed2/85966792784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d34e45f-bbc2-4bea-92be-4f5676243013/difference_between_stihl_250_and_251_chainsaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2430ed6-8c15-4da1-a5c4-cb5a426e8748/42518976517.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/searching_program_in_c.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/purble_place_cake_games_free.pdfIn PDF document text
    • http://teropisarazo.myartsonline.com/16205344857.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5940a941-d366-4261-88dd-3cc4b7fc7096/very_short_stories_in_telugu_to_write.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF921 5976 bytes
SHA-256: 423e681d9f8a63d761eb9bdc5c6c28b5e1ac5432955d48d807b5de268cede421
font_01_sfnt_off00010d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6E 10268 bytes
SHA-256: 13f4ede8183624f25c52b7020f2108042fa23cad50015040b40e6d42a29d2595